I'm just going off the top of my head right now but how about a achievement where you get an extra builders hut? The first 2 stars you would get gems but the 3rd star you get a builders hut.
1st star: Upgrade 50 things get 5 gems
2nd star: Upgrade 250 things and get 15 gems
3rd star: Upgrade 500 things and get an extra builders hut
The things that will count towards this achievement will be defenses, resources, barracks, heros.
Maybe include walls once they reach level 6 or 7 on up. So upgrading to levels 2-5 won't count towards this achievement.
If you to buy a builders hut from the store the cost would stay the same, such as 500 for the third one you buy from the store, 1000 for the forth one from the store, and 2000 for the fifth one from store.
We can still tweak the amount of things that need to be upgraded for each star level, but what do you clashers think about this idea?




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